FujiFilm GFX 50S II vs FujiFilm X-A3: read noise comparison

Input-referred read noise at base ISO: FujiFilm GFX 50S II 2.9 e⁻ (ISO 100), FujiFilm X-A3 2.6 e⁻ (ISO 200).

FujiFilm GFX 50S II

The FujiFilm GFX 50S II was measured at 26 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.19 DN, or 2.9 electrons at the sensor. From ISO 500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 10000 don't change analog gain (digital push). Full well at base ISO is about 39,910 electrons; unity gain is around ISO 240.

FujiFilm X-A3

The FujiFilm X-A3 was measured at 16 ISO settings from ISO 200 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 2.50 DN, or 2.6 electrons at the sensor. From ISO 500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 3200 don't change analog gain (digital push). Full well at base ISO is about 15,848 electrons; unity gain is around ISO 210.

FujiFilm GFX 50S II vs FujiFilm X-A3 read noise table

ISO	FujiFilm GFX 50S II	FujiFilm X-A3
50	0.801	–
100	1.189	–
125	1.395	–
160	1.705	–
200	1.866	2.497
250	2.266	2.990
320	2.751	3.630
400	3.294	4.469
500	4.000	5.389
640	4.925	6.774
800	6.021	8.000
1000	7.260	9.918
1250	8.938	12.042
1600	10.778	15.455
2000	13.737	18.765
2500	17.148	23.425
3200	21.706	29.041
4000	27.474	37.531
5000	35.017	45.887
6400	43.411	58.485
8000	54.192	–
10000	68.594	–
12800	78.249	–
25600	80.449	–
51200	64.893	–
102400	65.799	–

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